/**************************************************************************/
/*  file_access_buffer.h                                                  */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#pragma once

#include "core/io/file_access.h"

/** FileAccessMemory with auto-growing buffer */
class FileAccessBuffer : public FileAccess {
	GDSOFTCLASS(FileAccessBuffer, FileAccess);

public:
	enum ResizeBehavior {
		RESIZE_STRICT,
		RESIZE_OPTIMIZED,
	};

private:
	String path;
	Vector<uint8_t> data;
	ResizeBehavior resize_behavior = RESIZE_STRICT;
	mutable uint64_t pos = 0;
	size_t real_size = 0;

public:
	static Ref<FileAccess> create(ResizeBehavior p_resize_behavior = RESIZE_STRICT);

	virtual Error open_new();
	virtual Error open_custom(const Vector<uint8_t> &p_data); ///< open a file
	virtual Error open_internal(const String &p_path, int p_mode_flags) override; ///< open a file
	virtual String get_path() const override;
	virtual bool is_open() const override; ///< true when file is open

	virtual void seek(uint64_t p_position) override; ///< seek to a given position
	virtual void seek_end(int64_t p_position) override; ///< seek from the end of file
	virtual uint64_t get_position() const override; ///< get position in the file
	virtual uint64_t get_length() const override; ///< get size of the file

	virtual bool eof_reached() const override; ///< reading passed EOF

	virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const override; ///< get an array of bytes

	virtual Error get_error() const override; ///< get last error

	virtual Error resize(int64_t p_length) override;
	virtual void flush() override;
	virtual bool store_buffer(const uint8_t *p_src, uint64_t p_length) override; ///< store an array of bytes

	virtual bool file_exists(const String &p_name) override; ///< return true if a file exists

	virtual uint64_t _get_modified_time(const String &p_file) override { return 0; }
	virtual uint64_t _get_access_time(const String &p_file) override { return 0; }
	virtual int64_t _get_size(const String &p_file) override { return -1; }

	virtual BitField<FileAccess::UnixPermissionFlags> _get_unix_permissions(const String &p_file) override { return 0; }
	virtual Error _set_unix_permissions(const String &p_file, BitField<FileAccess::UnixPermissionFlags> p_permissions) override { return FAILED; }

	virtual bool _get_hidden_attribute(const String &p_file) override { return false; }
	virtual Error _set_hidden_attribute(const String &p_file, bool p_hidden) override { return ERR_UNAVAILABLE; }
	virtual bool _get_read_only_attribute(const String &p_file) override { return false; }
	virtual Error _set_read_only_attribute(const String &p_file, bool p_ro) override { return ERR_UNAVAILABLE; }
	virtual String get_as_utf8_string() const override;

	String whole_file_as_utf8_string() const;

	Error reserve(int64_t p_length);
	void set_auto_resize_behavior(ResizeBehavior p_resize_behavior);

	Vector<uint8_t> get_data() const;

	virtual void close() override {}

	FileAccessBuffer() = default;
	FileAccessBuffer(ResizeBehavior p_resize_behavior);
};
